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            <h1>GROOPS Documentation and Cookbook</h1>
<p>GROOPS is a software toolkit for gravity field recovery, GNSS processing, and statistical analysis of time series and spatial data.
It is licensed under GPLv3 and hosted at <a target="_blank" href="https://github.com/groops-devs/groops">GitHub</a>.</p>
<p>GROOPS depends on data files such as Earth rotation, Love numbers, and GNSS meta information.
An initial data set that is regularly updated is available on our FTP server,
<a target="_blank" href="https://ftp.tugraz.at/outgoing/ITSG/groops">https://ftp.tugraz.at/outgoing/ITSG/groops</a>.
You can choose between downloading the data directory or a single
<a href="https://ftp.tugraz.at/outgoing/ITSG/groops/data.zip">data.zip</a> with the same content.</p>
<p>Additional tutorial videos are available at our <a target="_blank" href="https://www.youtube.com/channel/UCzUirVN2JuEKZwdM9dIqllg/videos">YouTube channel</a>.
Questions about the usage of GROOPS can be posted in the
<a target="_blank" href="https://github.com/groops-devs/groops/discussions">Discussions</a>.</p>
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        <h5 class="card-title">General Information</h5>
          <p class="card-text">File formats and basic concepts for using GROOPS and its GUI.</p>
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          <li><a href="general.configFiles.html">Config files</a></li>
          <li><a href="general.parser.html">Parser</a></li>
          <li><a href="general.loopsAndConditions.html">Loops and conditions</a></li>
          <li><a href="general.constants.html">Constants and the setting file</a></li>
          <li><a href="general.parallelization.html">Parallelization</a></li>
          <li><a href="general.gui.html">Graphical User Interface (GUI)</a></li>
          <li><a href="general.fileFormat.html">File formats</a></li>
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        <h5 class="card-title">Mathematic Fundamentals</h5>
          <p class="card-text">Description of methods used throughout GROOPS.</p>
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          <li><a href="fundamentals.robustLeastSquares.html">Robust least squares adjustment</a></li>
          <li><a href="fundamentals.basisSplines.html">Basis splines</a></li>
          <li><a href="fundamentals.autoregressiveModel.html">Autoregressive models</a></li>
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        <h5 class="card-title">Cookbook</h5>
          <p class="card-text">Recipes to explore the GROOPS feature set.</p>
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          <li><a href="cookbook.instrument.html">Instrument data handling</a></li>
          <li><a href="cookbook.gnssNetwork.html">GNSS satellite orbit determination and station network analysis</a></li>
          <li><a href="cookbook.gnssPpp.html">GNSS precise point positioning (PPP)</a></li>
          <li><a href="cookbook.kinematicOrbit.html">Kinematic orbit determination of LEO satellites</a></li>
          <li><a href="cookbook.gravityFieldPod.html">Gravity field determination from POD data</a></li>
          <li><a href="cookbook.gravityFieldGrace.html">GRACE gravity field recovery</a></li>
          <li><a href="cookbook.regionalGeoid.html">Regional geoid determination</a></li>
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        <h5 class="card-title">Program/Class Reference</h5>
        <p class="card-text">Reference and documentation for all programs and classes in GROOPS.</p>
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          <li><a href="programType.html">List of programs</a></li>
          <li><a href="classes.html">List of classes</a></li>
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